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    <div id="app">
        <input type="checkbox" v-model="ok"/>是否同意许可协议<br>
        <button v-if="ok">下一步</button>
        <button v-else disabled>下一步</button>
        <button v-show="ok">下两部</button>
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            data () {
                return {
                    ok: false,
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        })
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